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4 years ago

Dark matter has been detected by its

Physics

1 answer:

Zinaida [17]4 years ago

7 0

Dark matter has been detected by its gravitational pull.

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As a fish jumps vertically out of the water, assume that only two significant forces act on it: an upward force F exerted by the

Sever21 [200]

Answer:

$a = 12.32 \ m/s^2$

$F = 1017.52 \ N$

Explanation:

From the question we are told that

The length of the Chinook salmon is $l = 1.50 \ m$

The mass of the Chinook salmon is $m = 46.0 \ kg$

The upward velocity in water is $u = 3.00 \ m/s$

The upward velocity in air is $v = 5.80 \ m/s$

Generally from kinematic equations

$v^2 = u^2 + 2as$

=> $5.80^2 = 3.00^2 + 2 * a * [ [\frac{2}{3} * l ]$

=> $5.80^2 = 3.00^2 + 2 * a * [ [\frac{2}{3} * 1.5 ]$

=> $5.80^2 = 3.00^2 + 2 * a * [1 ]$

=> $a = 12.32 \ m/s^2$

Generally magnitude of the force F during this interval in N is mathematically represented as

$F = m (a + g )$

=> $F = 46.0 (12.32 + 9.8 )$

=> $F = 1017.52 \ N$

5 0

4 years ago

A beam of light traveling in air strikes a slab of transparent material. The incident beam makes an angle of 40° with the normal

Molodets [167]

Answer:

V = 2.05× 10⁸ m/s

Explanation:

We are given;

The angle of the incidence; i = 40°

Angle of refraction; (r) = 26°

For us to find the speed of light in the material, we'll use Snell's law

From shell's law, we know that;

n = sin i/sin r = speed of light in air/Speed of light in the medium

Now, speed of light in air = 3 × 10⁸ m/s

Lets speed of light in medium be V

Thus, plugging in the relevant values to obtain;

Sin 40°/sin 26° = 3×10⁸/V

Let's make V the subject;

V = 3 × 10⁸× sin 26°/sin 40°

V = 2.05× 10⁸ m/s

7 0

3 years ago

When a battery, a resistor, a switch, and an inductor form a circuit and the switch is closed, the inductor acts to oppose the c

vladimir1956 [14]

Answer:Time constant gets doubled

Explanation:

Given

L-R circuit is given and suppose R and L is the resistance and inductance of the circuit then current is given by

$i=i_0\left [ 1-e^{-\frac{t}{\tau }}\right ]$

where $i_0$ is maximum current

i=current at any time

$\tau =\frac{L}{R}=time\ constant$

$\tau '=\frac{2L}{R}=2\tau$

thus if inductance is doubled then time constant also gets doubled or twice to its original value.

5 0

4 years ago

PLEEEASEEEEEE HELPPPPP PLEASEEEEEEEEEE science

valkas [14]

Answer:

Explanation:

transverse wave

Hope this helps you!

7 0

3 years ago

(a) what is the system of interest if the acceleration of the child in the wagon is to be calculated? (select all that apply.)

Leno4ka [110]

since child is moving along with the wagon and we need to find the acceleration of child inside that wagon then in this case the system of interest must be child + wagon

System of interest will be the system that is used to find the force or acceleration using Newton's law

Here we have to assume that system on which if we will calculate the forces then the net value of force on that system will help to calculate the unknown quantities

So here our system will be boy + wagon

6 0

3 years ago